Gas mixer



Marcvh ll, 1930. c. T. HowsoN GAS MIXER Filed oct. 1s, '1924 Muffy,

Patented. Mar. 11, 1930 UNITEDy STATES PATENT OFFICE CHARLES T. HOWSON, OF SILVER CREEK, NEW YORK, ASSIGNOR TO WALTER M. BUCH# HOLTZ AND'ALBERTv B. CHAPMAN, OF SILVER CREEK, NEW YORK GAS MIXER Application filed October 13, 1924. Serial No. 743,303.

y My invention relates to improvements in gas mixers, and more particularly to that type in which a mixing chamber is provided into which air and gas is led to be mixed therein.

The primary object of my invention is the provision of agas mixer of this kind Which.

is inexpensive, exceedingly simple, and in Y which a thorough commingling of air and l" gas is provided for Within space. Another object of my invention is to provide a gas mixer in which novel means is provided for regulating the admission of air according to the admission of gas so that the proper quantity of air Will be provided for the gas to assure highest efficiency.

' A further object of my invention is the provision of a gas mixer in which .gas is economically mixed With air and delivered in proper proportions from the mixer.

A still further obj ect of my invention is to provide a mixer having adjustable gas and air controlling-elements whereby the amount of gas admitted to the mixer and also the quantity of air for proper mixture with the gas, may be regulated.

With the above and other objects in view the invention consists in the novel features ofy construction and in the arrangement and combination of parts to be hereinafter described and more particularlyV pointed out in the subjoined claims.

In the drawings Fig. 1 is a longitudinal section through the gas mixer with yits fittings attached thereto.

Fig. 2 is a transverse section taken on line 2-2, Fig. 1. l

Fig. 3 is a transverse section taken on line Fig. t is a longitudinal section taken through the inlet end of the mixer and showing an adjustablev air controlling-element therein. l

45 Fig. 5 is a transverse' section taken on line 5 5, Fig. 4, looking in the direction of the arrow crossing said line.

Fig. 6 is a longitudinal section through the inner end of the air-nozzle, showing the manner in which the air delector' thereof is attached thereto.

The mixer comprises a casing or body portion having an' air-nozzle 8 at one end and a reducer cap or concentrator 9 at its other end. The body portion or casing comprises an'elongated cylindrical member or mixing chamber 10, a hollow head or enlargement 11 at one end thereof, and an external flange 12 at the other end.y The enlargement or head-end of said casing serves as the inlet end thereof, while the flanged end thereof serves as the outlet end.

-The reducer cap or concentrator 9 has an outstanding flange 13 through which and the flange 12 of the casing, bolts 14 are passed, said bolts serving to fasten said reducer cap or concentrator to the outlet end of said casing. The reducer cap or concentrator is gradually reduced in diameter from the flanged portion thereof toward its outer end and is provided with an axial boss 15 which is internally threaded and receives the threaded end of an outlet or mixture pipe 16.

The hollow head or enlargement 11 is formed by a Wall 17 extending outwardly from the inlet end of the elongated cylinder or mixing chamber, a cylindrical Wall 18, and an outer end Wall 19 parallel With and spaced from the Wall 17. The Wall 19 has an axial threaded opening formed therein, and to assure an extended threaded portion at this point, said Wall is provided With an inwardly-directed flange 20.

The air-nozzle 8 is threaded into the axial 85 threaded opening formed through the end Wall 19 and its ange 20, and the inner end of said nozzle extends a distance beyond the inner end of said flange. Said air-nozzle is reduced in diameter at its outer end, as at so 21, and into this reduced portion an air inlet pipe 22 is threaded.

The circular threaded wall thus formed,

gitudinally within the lend wall 19 of the en*` largement or head.V rlhe grease, oil, or other substance confined within the groove 2B ren; ders the connection of the air-nozzle to the hollow head or enlargement air-tight.

The air inlet pipe 22 opens into the interior of the air-nozzle, which is cylindrical a distance inwardly from said pipe, as at 26. From thiscylindrical lportion the interior of said air-nozzle is gradually enlarged toward its inner end by flaring the wall, as at 27, vto a plane passing transversely through the air-nozzle near its inner extremity, andl from this plane said inner wall is flared at a slightly greater angle directly tothe inner extremity of said nozzle, as at 28. The outer circumferential surface of saidV air-nozzle is beveled or tapered at the inner end thereof, as at 29, and this beveled or tapered portion meets'the inner internally-flared portion 28 with a sharp angle so that a sharp circular edge is provided at the inner extremity of said air-nozzle. Y

` At the junction of the outstanding wall 17 withthe cylindrical wallof the mixing cham' ber 1l, an internal fiange 30 is provided, part of said flange extending into the hollow head or enlargment 11. The inner surface vof said flangeis tapered inwardly from the hollow header enlargement to conform to the externally-tapered inner portion at the inner end of the air-nozzle, which inner end said internal Vflange 30, or at least a part thereof, surrounds in spaced relation. *The annular space 31 thus formed between said internal flange and said air-nozzle serves as the gas inlet or passage for the mixing cham* ber. Y

Vllt may Vhere be stated that by reason of the internal flange 30 extending into the hollowv head or enlargement and the flange 2O extending inwardlyl from the outer wall '19 of said hollow head or enlargement, and owing tothe fact that the air-nozzle extends inwardly beyond said last-mentioned flange, a substantially annular gas chamber 32 is formed in said hollow head or enlargement. Entering said chamber at one point is a gas inlet pipe 33, said hollow head or enlargement be- 1,749,914VVV annular space 35 between thetwo flanges 75 which serves as a passage or connection be-V tween the annular gas chamber 32 and the annular gas inlet or passage 31.y This passage or connection may',ghewever, be considered a restricted or reduced portion of the annular gas chamber.

Mountediin vthe airfno'zzle is an air-de-` fiecting cone 36, which has its apex directed toward the air inlet pipe 22 and its base terminating at or near theV plane ofthe inner end of said air-nozzle. This air deflecting` cone mayl be .of any suitable construction, butinthedrawings I have shown the same stamped or formed'of sheet metal and they v conical wallthereeof is spaced Vfrom the sur-VVV rounding wall of the air-nozzle to form annular flaring lair-passage 37. V'llhe cone may be heldcentrally within the inner-'portion of the air-nozzle in any suitable manner, but in the `drawings I have shown the same provided with'arms 38 extending radially there# from and bent over the externally beveled or tapered portion at the inner end of the airnozzle, at which point they are soldered, or otherwise fastened.

ln the illustration shown in the drawings, the annular inwardly-tapered gas inlet or passage 31 and the annular inwardly-flaring air passage 37 are shown somewhat exaggerated, since in practiceV the walls of these pasl sages are incloser relationl than shown, but it is believed that in order to make clear theac-V tion of the gas anda-ir as they pass through these passages, exaggerationin dimensions of these passages is desirable for purposes of il-` lustration. l

lt will be understood that the air-nozzle y8 is adjustable within the hollowrhead or enlargement 11, and forA this purpose the reduced portion at the outer end thereof may be made square, hexagonal er `given any other suitable formationy wherebya tool, such as a wrench or the like, 'can be conveniently ap-,f plied for rotating said air-nozzle,either tok the right or left, witha view Yof threading the same'inwardly or outwardly, and as the beveled orrtapered external portion at the inner end of the air-nozzle is parallel with the inner wall of' the internal flange 30, the threading of the air-nozzle inwardly to a greater degree than that shown in the drawing', willy narrow or restrict the annularv inwardly-flaring gas inlet or passage 31,7wh`ile Y no Y V ci

the threading of saidY air-nozzle outwardly Y isc The gas enters the annular gas chamber 32 within said hollow head or enlargement from the gas inlet pipe, which may have a suitable valve therein to regulate or entirely shut orf the supply of gas, and from this chamber the gas escapes through the space 35 between flanges 2O and 30 and passes through the annular inwardly-flared gas inlet or passage 3l in the forni of a circular stream toward a common point within the mixing chamber indicated at 39. l

The air passes into the air-nozzle from the air inlet pipe 22, which may also have a valve therein, and is directed through .the inward-l ly=laring annular air passage between the inner portion of the wall of said air-nozzle and the air deilectin'g cone, and the annular body of air thus supplied intersects the inrushing aimular body of gas, preventing the gas from passing directly along the lines indicated at 40 and meeting at said common point 39, the gas and air thus entering` the mixing chamber in intersecting lines and in streams of annular formation, thoroughly commingle within the mixing chamber and continue through said mixing chamber, while disturbed in their respective courses, so that a thorough commingling of gas and air takes place. The resultant mixture passes out as a combustible product through the mixture outlet pipel. The intersecting of the annular stream of gas by the annular stream of air issuing from the air-nozzle denects the annular stream of gas from its course toward the common center 39 and causes a whirling action within the mixing chamber, with the result that a thorough commingling of gas and air takes place throughout the length of the mixing chamber, and it will be noted that this mixing chamber is devoid of internal walls or other obstructions, so that a free passage for the gas and air is assured. The pressure of the gas entering said mixing chamber is increased before it reaches the point of consumption, by reason of the gas passing through the reducer cap or concentrator 9 and escaping at the restricted portion of said cap or concentrator through the mixture outlet pipe 16.

In the construction shown in Figs. l to 4, adjustment is provided only for the admission of gas into the mixing chamber; but in the modilication shown in Figs. 5 and 6,'

l have provided an adjustable air-deflector in connection with the adjustable air-nozzle, and in this construction the air-nozzle is provided with a cross bar 4l and the air-denecting cone 36 has a threaded supporting stem 42 extending outwardly from its apex, said stem being threaded through a threaded axial opening in said cross bar. By rotating said stem, the cone is moved outwardly or inwardly, as may be desired, to decrease or increase the width of the annular flaring air passage 37 between said conek and the surrounding portion of the wall of said air mixer. In this manner the air'can be adjusted in proper proportion to the 'gas admitted into the mixing chamber'.

Having' thus described my invention, what I claim is 1. A gas mixer, comprising a mixing chamber having an outlet at one end, a hollow head at its other end, and an internal flange at the junction of said hollow head and mixing chamber' having` its inner' peripheral wall tapered inwardly toward said mixing chamber, an air nozzle axially adjustable in said hollow head and yhaving an externally-tapered portion and an internal flaring portion at its inner end, the surface of said externally-tapered portion being parallel with the inwardly-tapered wall o f said internal flange and being spaced therefrom to form an annular inwardly-tapered inlet, a gas inlet pipe opening into said hollow head, andr a cone within said air'noz/z'le spaced from the internally ilared portion thereof and forming between they two an annular inwardlyilared air passage'through which an annular nlm or body' of air is adapted to pass to intersect a'n annular film or body of gas at said annular gas inlet traveling' into said mixing chamber.

A gas mixer comprising a casing having an end Wall provided with a threaded opening, an annular grease groove formed in said threaded opening, a grease duct extending outwardly from said grease groove, means for delivering grease through said duct into said groove, and lan, air nozzle threaded into said opening' and extending inwardly beyond said vllange, said air nozzle serving to close said grease groove, an air defleeting eone positioned 'axial-ly in said air nozzle at its inner end and s aced from the wall of said nozzle, andan in ernal flange formed at the junction of s'aid mixing chamber and said hollow head and extending partly into said head and surrounding ythe inner end of said air nozzle, said internal flange having its inner peripheral wall tapered toward the interior of said mixing chamber and said air nozzle having its exterior tapered inwardly parallel with the tapered wall of 'said internal flange and spaced from the llatterY to form an annular inwardly-tapered gas inlet, and a gas inlet pipe connected to said hollow'head.

3: A gas mixer,- comprising an elongated chamber having an voutlet at one end and an inlet axially disposed at its other end pro'- vded with an inwardly-tapered wall, a nozzle adjustably retained-,with its inner end partly yentered into said inlet and having its exterior surfacezat its inner end tapered inwardly to conform to the tapered wall of said inlet, said tapered inner end being spaced freinA said tapered wall to form an annular inlet between the two, said nozale having an inwardly-ilared internal portion at its inner eau, and a @ne fitted into' the inner "end of inwardly-flared internal portion to form a second annularv inlet between the two, means to supply gas to all vpoints of one of said annular inlets, and means to supply air to`r all points of the other annular inlet so'as to intersectV the entering gas at its annular inlet.

4. A gas mixer,ncomprisingjan elongated cylindricalmixing,chamber having an outlet at oneend and a hollow head at its other y end provided with athreaded. axial opening in its end wall, said mixer having an internal flange on its wall atthe junction of said mixing chamber with'said hollow head, said internal kfian'gey extending into said mixing chamber and into said hollow head andfhaving its inner peripheral wall tapered inward# ly toward the interior of said mixing cham# ber, an kair nozzle-threaded into the outer wall of saidv hollow head and extending part- I way into said internal flange and being spaced spaced from'fthe wall of said air nozzle to form an annular inwardly-dared air passage and said threaded stemY being adjustable in said d iametraly bar to cause'the cone to be' moved inwardly oroutwardly to enlarge or passage. Y j :in4 testimony whereof I affix my signature. CHARLES T. HOWSON.

therefrom, said internal flange and air nozzle Y forming an annular gas chamber within said hollow head connected with said mixing chamber through the medium of the space be tween said flange and said air nozzle, an air inlet pipeconnected to said airV nozzle,a gas inlet pipe connected to said hollow head, and a cjone axially disposed within the airV nozzle atthe inner end thereof and spaced Vfrom the surrounding portion of the wall of.l said air nozzle toform an inwardly-Haring air passage at theinner end of said nozzle. f

5. A 'gas mixer,comprising a `mixing chamber having an axial opening at one end provided with anv inwardly-tapered inner vperipheral wall, and an outlet spaced from said axial opening,ran airvnozzle vhaving van externally-tapered portion at its inner end spaced from the inwardly-tapered wall. of said axial opening to form an annular inwardly-tapered gas passage, said air nozzle having an air inlet, a cylindrical interior portion yadjacent said air inlet, an inwardly-flared portion adjacent said cylindrical interior, and a second inwardly-flared portion extending from said first-mentioned inwardly-flared portion to the inner. extremity/of said nozzle, said second-mentioned inwardly-dared portion. be-

ing ,at a greater angle than said first-mentioned inwardly-flared portion and meeting the externally-tapered portion of said air nozzle at a-sharp angle, and a coneY disposed within said flared portions and extending into the cylindrical portion of said air nozzle, Y

said cone having its wall spaced from the Y walls of said inwardly-flared portions toy form an annular air passage through which a1r 1s passed and intersects the gas passing through said annular inwardly-tapered gas portion thereof forming one wall of said gas 70 through said diametral bar, said cone 'being Vdiminish said annular inwardly-flared Vair 

